CN111381428A

CN111381428A - Light source system and projection device

Info

Publication number: CN111381428A
Application number: CN201811642807.XA
Authority: CN
Inventors: 郭祖强; 鲁宁; 李屹
Original assignee: Appotronics Corp Ltd
Current assignee: Shenzhen Appotronics Corp Ltd
Priority date: 2018-12-29
Filing date: 2018-12-29
Publication date: 2020-07-07
Anticipated expiration: 2038-12-29
Also published as: CN111381428B; WO2020135304A1

Abstract

The invention relates to a light source system and a projection device. The light source system includes: a light source comprising a first light source; a wavelength conversion device; the light condensing device comprises a condensing lens, and the condensing lens is used for condensing the exciting light emitted by the first light source on the wavelength conversion device; and the light deflection device is arranged in a light path between the first light source and the wavelength conversion device in a time-sharing mode and is used for deflecting part of light beams emitted by the first light source so as to adjust the area of light spots irradiated on the wavelength conversion device by the first light source. Compared with the prior art, the light source system can improve the light conversion efficiency of the exciting light.

Description

Light source system and projection device

Technical Field

The invention relates to the technical field of projection display, in particular to a light source system and a projection device.

Background

With the continuous development of projection display technology, the market demands higher performance parameters of projection devices, and high brightness, high dynamic range, high resolution, and as large color gamut as possible become development trends. At present, a laser fluorescence mixed light source has the advantages of long service life, high brightness and high cost performance relative to a bulb light source, an LED light source and a pure laser light source respectively, and becomes an ideal light source of projection equipment. However, the spectral wavelength range of the fluorescence generated by laser excitation is wide, and there is a large limitation in expanding the color gamut range compared to a pure laser light source, and therefore, in order to expand the color gamut range, the proportion of the pure laser light source in the laser-fluorescence mixed light source needs to be increased.

In the prior art, the method of increasing the percentage of pure laser light sources in the hybrid light source is to directly increase the percentage of pure laser light sources, as shown in fig. 1, the method includes an excitation light source 101a for emitting blue laser light, and a red laser light source 101b and a green laser light source 101c which are arranged opposite to the side of the fluorescent color wheel 102 where the blue laser light enters and are used for increasing the percentage of pure laser light sources. As shown in fig. 2, in order to adapt the light source system, the fluorescent color wheel 102 includes a reflective scattering region D for reflective scattering of the blue laser emitted from the excitation light source 101 a; the fluorescent color wheel also comprises a transmission scattering area E positioned at the inner circle, and a reflection type red fluorescent area F and a green fluorescent area G positioned at the outer circle. The red fluorescence area F is used for receiving the exciting light emitted by the exciting light source 101a and converting the wavelength to reflect red fluorescence, and meanwhile, the transmission scattering area E transmits the red laser emitted by the red laser source 101b, scatters and eliminates speckles and then combines the red laser with the red fluorescence to emit light; the green fluorescence region G is configured to receive the excitation light emitted from the excitation light source 101a and perform wavelength conversion to reflect green fluorescence, and the transmission scattering region E transmits the green laser light emitted from the green laser light source 101c, scatters the green laser light to eliminate speckle, and then combines the green laser light with the green fluorescence to emit.

However, the above-described light source system has the following problems: when the excitation light emitted from the excitation light source 101a enters the fluorescent color wheel 102 to convert the wavelength into red fluorescence or green fluorescence, the light spot portion of the excitation light is in an unexcited state, i.e., half of the light spot enters the transmission scattering area E of the inner ring, which not only reduces the light conversion efficiency of the red fluorescence area F and the green fluorescence area G and causes energy waste, but also further reduces the projection display effect because the transmitted blue laser easily generates optical interference with the red laser/green laser on the other side of the fluorescent color wheel.

Disclosure of Invention

In order to solve the technical problem that the light conversion efficiency of the existing light source system is low during the wavelength conversion of exciting light, the invention provides a light source system capable of improving the light conversion efficiency of the exciting light, which comprises: a light source comprising a first light source; a wavelength conversion device; the light condensing device comprises a condensing lens, and the condensing lens is used for condensing the exciting light emitted by the first light source on the wavelength conversion device; and the light deflection device is arranged in a light path between the first light source and the wavelength conversion device in a time-sharing mode and is used for deflecting part of light beams emitted by the first light source so as to adjust the area of light spots irradiated on the wavelength conversion device by the first light source.

In one embodiment, the light deflecting device is arranged in the optical path between the first light source and the light collecting device in a time-sharing manner.

In one embodiment, the light deflecting means is arranged in time division in the optical path between the light collecting means and the wavelength conversion means.

In one embodiment, the wavelength conversion device includes a wavelength conversion region, a reflection scattering region, and a transmission scattering region, where when the excitation light emitted from the first light source is converged by the light condensing device at the wavelength conversion region of the wavelength conversion device, the light deflecting device is located in a light path between the first light source and the wavelength conversion device to reduce a light spot area of the excitation light on the wavelength conversion device, and when the excitation light emitted from the first light source is converged by the light condensing device at the transmission scattering region of the wavelength conversion device, the light deflecting device deviates from the light path between the first light source and the wavelength conversion device.

In one embodiment, the light source further comprises a second light source and a third light source, the first light source is used for emitting blue light excitation light, ultraviolet light excitation light, infrared light excitation light or green light excitation light; the second light source is used for emitting one of red light, blue light and green light; the third light source is used for emitting one of red light, blue light and green light.

In one embodiment, the light source system further comprises a light collecting assembly and a light homogenizing device; the light collection assembly collects emergent light of the wavelength conversion device and guides the emergent light to enter the light homogenizing device for light homogenizing treatment.

In one embodiment, the light collection assembly comprises a bowl-shaped reflecting surface, the reflecting surface is positioned between the condensing lens and the wavelength conversion device, and the side of the reflecting surface opposite to the wavelength conversion device is concave and coated with a high-reflection film; and a light through hole is formed in the central area of the bowl of the reflecting surface.

In one embodiment, the wavelength conversion device further comprises a filter region; the light collection assembly comprises a collection lens group, an area diaphragm and a light guide device, wherein the area diaphragm comprises a blue light transmission area and a reflection area; the blue light exciting light emitted by the first light source sequentially passes through the blue light transmission area and the collecting lens group to be incident to the wavelength conversion device; emergent light of the wavelength conversion device is reflected by the collecting lens group and the reflection area in sequence, and guided by the light guide device to enter the dodging device after passing through the filter area.

In one embodiment, the wavelength conversion device further comprises a filter region; the light collection assembly comprises a collection lens group, a dichroic sheet capable of transmitting blue light and reflecting red light and green light, a reflector and a light guide device; the blue excitation light emitted by the first light source sequentially passes through the dichroic sheet and the collecting lens group to be incident to the wavelength conversion device; red light or green light in emergent light of the wavelength conversion device is reflected by the collecting lens group and the dichroic sheet in sequence, guided by the light guide device to pass through the filter region and then enter the dodging device; blue light in emergent light of the wavelength conversion device sequentially passes through the collecting lens group, the dichroic sheet for transmission, the reflector for reflection and the dichroic sheet for transmission, and is guided by the light guide device to pass through the filter area and then enter the dodging device.

In one embodiment, the optical deflection apparatus includes an optical deflection device and a driving member capable of driving the optical deflection device to move, and the driving member drives the optical deflection device to move periodically.

In one embodiment, the light deflecting device includes one or more of a wedge prism, a lens, and a mirror.

In one embodiment, the first light source comprises a plurality of lasers arranged in an array; the light source system also comprises collimation lenses, the number of which is equal to that of the lasers, and the collimation lenses are arranged in one-to-one correspondence with the lasers.

The invention further provides a projection device comprising the light source system in any one of the above embodiments.

Compared with the prior art, the light source system provided by the invention has the advantages that the light deflection device is arranged in the light path between the first light source and the wavelength conversion device in a time-sharing manner and is used for deflecting part of light beams emitted by the first light source, so that the size and the position of an exciting light spot incident on the wavelength conversion device are adjusted, the exciting light spot is converged in the wavelength conversion region as much as possible, and the light efficiency loss of the light spot converged in the transmission scattering region is reduced.

Drawings

Fig. 1 is a schematic diagram of a light source system in the prior art.

Fig. 2 is a front view of the fluorescent color wheel in the light source system shown in fig. 1.

Fig. 3 is a schematic structural diagram of a light source system according to a first embodiment of the present invention.

Fig. 4 is a front view of a wavelength conversion device in the light source system shown in fig. 3.

Fig. 5 is a schematic structural diagram of the light source system shown in fig. 3 in a modified embodiment.

Fig. 6 is a schematic structural diagram of the light source system shown in fig. 3 in another modified embodiment.

Fig. 7 is a schematic structural diagram of a light source system according to a second embodiment of the present invention.

Fig. 8 is a front view of a wavelength conversion device in the light source system shown in fig. 7.

Fig. 9 is a schematic structural diagram of a light source system according to a third embodiment of the present invention.

Fig. 10 is a front view of a wavelength conversion device in the light source system shown in fig. 9.

Description of the main elements

Light source system

100, 200, 300

First light source

111, 211, 311

Laser 1111

Second light source

112, 212, 312

Third light sources

113, 213, 313

Light-concentrating

devices

120, 220, 320

Condenser lens 121

Wavelength conversion devices

130, 230, 330

Wavelength converting regions

131, 231, 331

Red fluorescence excitation region 131r, 231r, 331r

Green fluorescence excitation regions 131g, 231g, 331g

Reflective scattering region

132, 232, 332

Transmission scattering region

133, 233, 333

Filter regions

234, 334

Blue

light filter regions

234b and 334b

Red

light filter regions

234r and 334r

Green light filtering regions 234g, 334g

Optical deflection device

140, 240, 340

Optical deflection device 141

Driving member 142

Light collection assemblies 150, 250, 350

Reflecting surface 151

Light through hole 1511

Collection lens groups

251, 351

Regional diaphragm 252

Blue light transmitting region 2521

Reflective region 2522

Light guide 253

Relay lens 2531

Mirrors

2532, 353

Dodging device

160, 260, 360

Dichroic sheet

170, 352

First collimating lens 181

Second collimating lens 182

Third collimating lens 183

The following detailed description will further illustrate the invention in conjunction with the above-described figures.

Detailed Description

Referring to fig. 3, fig. 3 is a schematic structural diagram of a light source system 100 according to a first embodiment of the present invention. The light source system 100 includes a first light source 111, a second light source 112, a third light source 113, a light condensing device 120, a wavelength conversion device 130, a light deflecting device 140, a light collecting assembly 150, and a light uniformizing device 160. The first light source 111 is configured to generate and emit excitation light, preferably blue excitation light, and it is understood that the excitation light is not limited to the blue excitation light, and may be ultraviolet excitation light, infrared excitation light, or green excitation light. The second light source 112 is used to generate and emit one of red light, blue light, and green light. The third light source 113 is for generating and emitting one of red light, blue light, and green light. The first light source 111, the second light source 112, and the third light source 113 may be laser light sources, or may be other semiconductor light sources such as LED light sources.

In the first embodiment, the first light source 111 is a laser light source capable of emitting blue excitation light, and includes a plurality of lasers 1111 arranged in an array. The light-gathering device 120 includes a light-gathering lens 121, and the light-gathering lens 121 is disposed between the first light source 111 and the wavelength conversion device 130, and is used for gathering the blue excitation light emitted from the first light source 111 onto the wavelength conversion device 130.

Further, the second light source 112 is used for generating and emitting red light, the third light source 113 is used for generating and emitting green light, and the light source system 100 further includes a dichroic plate 170 for reflecting the red light emitted from the second light source 112 and simultaneously transmitting the green light emitted from the third light source 113. Specifically, the second light source 112 and the third light source 113 are both located on a side of the wavelength conversion device 130 opposite to the first light source 111. The red light emitted from the second light source 112 is reflected by the dichroic plate 170 and then enters the wavelength conversion device 130, and the green light emitted from the third light source 113 is transmitted by the dichroic plate 170 and then enters the wavelength conversion device 130. It will be appreciated that in other embodiments, the second light source 112 may be used to generate and emit green light and the third light source 113 may be used to generate and emit red light, where the corresponding dichroic plate 170 may reflect the green light emitted from the second light source 112 and simultaneously transmit the red light emitted from the third light source 113.

Referring to fig. 4, the wavelength conversion device 130 includes a wavelength conversion region 131, a reflective scattering region 132 and a transmissive scattering region 133. In practical application, the wavelength conversion device 130 performs a periodic circular rotation, so that the blue excitation light emitted from the first light source 111 enters the wavelength conversion region 131 and the reflection scattering region 132 according to a time sequence, wherein the wavelength conversion region 131 is coated with phosphor, the blue excitation light entering the wavelength conversion region 131 can excite the phosphor to generate fluorescence, and the blue excitation light entering the reflection scattering region 132 is directly reflected and speckle is eliminated through scattering. The transmission scattering region 133 serves to transmit red and green light incident to the wavelength conversion device 130.

Specifically, the wavelength converting region 131, the reflective scattering region 132 and the transmissive scattering region 133 form a circular ring, and the center of the circular ring is the rotation center of the wavelength converting device 130. The wavelength conversion region 131 and the transmission scattering region 133 are respectively C-shaped, the wavelength conversion region 131 is located at the outer circle, and the transmission scattering region 133 is located at the inner circle. The wavelength converting region 131 is equally or unequally divided into a red fluorescence excitation region 131r capable of generating red fluorescence and a green fluorescence excitation region 131g capable of generating green fluorescence.

When the blue excitation light emitted from the first light source 111 enters the red fluorescence excitation region 131r, the blue excitation light excites the phosphor to generate red fluorescence, and simultaneously, the second light source 112 emits red light, and the red light enters the wavelength conversion device 130 and is transmitted to the other side of the wavelength conversion device 130 through the transmission scattering region 133 to combine with the red fluorescence, at this time, the exit light of the wavelength conversion device 130 is a combined light including the red fluorescence and the red light emitted from the second light source 112.

When the blue excitation light emitted from the first light source 111 enters the green excitation region 131g, the blue excitation light excites the phosphor to generate green fluorescence, and simultaneously, the third light source 113 emits green light, and the green light enters the wavelength conversion device 130 and is transmitted to the other side of the wavelength conversion device 130 through the transmission scattering region 133 to combine with the green fluorescence, and at this time, the emergent light of the wavelength conversion device 130 is a combined light including the green fluorescence and the green light emitted from the third light source 113.

When the blue excitation light emitted from the first light source 111 enters the reflective scattering region 132, the blue excitation light is directly reflected and the speckle is eliminated by scattering, and at this time, the emission light of the wavelength conversion device 130 is blue light.

It should be noted that the spot sizes of the red light, the green light and the blue light emitted from the wavelength conversion device 130 should be the same. In the prior art, the sum of the widths of the wavelength conversion region 131 and the transmission scattering region 133 is equal to the width of the transmission scattering region 133, and when a blue excitation light spot emitted from the first light source 111 enters the wavelength conversion region 131, a phenomenon that a part of the light spot enters the transmission scattering region 133 exists, which causes a decrease in the light conversion efficiency of the blue excitation light for exciting fluorescence. If the blue excitation light spot of the first light source 111 can be completely incident on the wavelength conversion region 131, the light conversion efficiency of the blue excitation light for exciting the fluorescence can be greatly improved. Therefore, the light source system 100 provided in the first embodiment can adjust the spot size and the position of the blue excitation light incident on the wavelength conversion device 130 to make the blue excitation light converge on the wavelength conversion region 131 as much as possible, so as to reduce the light efficiency loss of the light spot converging on the transmission scattering region 133.

The light source system 100 according to the first embodiment disposes the light deflecting device 140 in a time-sharing manner in the optical path between the first light source 111 and the light collecting device 120, and deflects a part of the light beam emitted from the first light source 111. Specifically, when the blue excitation light emitted from the first light source 111 is converged in the wavelength converting region 131 of the wavelength converting device 130 by the condensing lens 121, the light deflecting device 140 is in the optical path between the first light source 111 and the condensing device 120; when the blue excitation light emitted from the first light source 111 is converged in the reflective diffusion region 132 of the wavelength conversion device 130 by the condensing lens 121, the light deflecting device 140 deviates from the optical path between the first light source 111 and the condensing device 120. At this time, the light deflecting device 120 is in the light path between the first light source 111 and the light condensing device 120 for reducing the spot area of the blue excitation light emitted from the first light source 111 on the wavelength conversion device 130.

It is understood that, in an alternative embodiment, referring to fig. 5, when the blue excitation light emitted from the first light source 111 is converged in the wavelength converting region 131 of the wavelength converting device 130 by the condensing lens 121, the light deflecting device 140 deviates from the light path between the first light source 111 and the condensing device 120; when the blue excitation light emitted from the first light source 111 is converged in the reflective scattering region 132 of the wavelength conversion device 130 by the condensing lens 121, the light deflecting device 140 is located in the light path between the first light source 111 and the condensing device 120. At this time, the light deflecting device 120 is in the light path between the first light source 111 and the light condensing device 120 for increasing the spot area of the blue excitation light emitted from the first light source 111 on the wavelength conversion device 130.

In another modified embodiment, referring to fig. 6, the optical deflection device 140 may also be time-shared in the optical path between the light condensing device 120 and the wavelength conversion device 130. Specifically, when the excitation light emitted from the first light source 111 is converged in the wavelength converting region 131 of the wavelength converting device 130 by the condensing lens 121, the light deflecting device 140 is in the optical path between the condensing device 120 and the wavelength converting device 130; when the excitation light emitted from the first light source 111 is converged in the reflective diffusion region 132 of the wavelength conversion device 130 by the condensing lens 121, the light deflecting device 140 deviates from the optical path between the condensing device 120 and the wavelength conversion device 130. At this time, the light deflecting device 120 is in the light path between the light condensing device 120 and the wavelength conversion device 130 for reducing the spot area of the blue excitation light emitted from the first light source 111 on the wavelength conversion device 130.

It is understood that, as a modification of the above-described another modified embodiment, when the excitation light emitted from the first light source 111 is condensed in the wavelength converting region 131 of the wavelength converting device 130 via the condensing lens 121, the light deflecting device 140 is deviated from the optical path between the condensing device 120 and the wavelength converting device 130; when the excitation light emitted from the first light source 111 is converged in the reflective diffusion region 132 of the wavelength conversion device 130 by the condensing lens 121, the light deflecting device 140 is located in the optical path between the condensing device 120 and the wavelength conversion device 130. At this time, the light deflecting device 120 is in the light path between the light condensing device 120 and the wavelength conversion device 130 for increasing the spot area of the blue excitation light emitted from the first light source 111 on the wavelength conversion device 130.

Specifically, the optical deflection apparatus 140 includes an optical deflection device 141 and a driving member 142 capable of moving the optical deflection device 141. The driving member 142 drives the optical deflection device 141 to move periodically.

In the first embodiment, the optical deflecting device 141 is a wedge prism. In other embodiments, the optical deflecting device 141 may also be an optical device such as a lens or a mirror capable of deflecting light, and is used to deflect a portion of the excitation light beam emitted from the first light source 111, so as to adjust the spot size and position at which the excitation light emitted from the first light source 111 is converged on the wavelength conversion device 130.

The light deflecting device 140 is used to adjust the spot area and size of the excitation light emitted from the first light source 111 on the wavelength conversion device 130, and specifically, when the light deflecting device 140 is in the optical path for reducing the spot area of the excitation light emitted from the first light source 111 on the wavelength conversion region 131, the light source system 100 places the light deflecting device 140 in the optical path between the first light source 111 and the wavelength conversion device 130 when the emission of red light and green light is required, and the light source system 100 deviates the light deflecting device 140 from the optical path between the first light source 111 and the wavelength conversion device 130 when the emission of blue light is required. When the light deflecting device 140 is in the optical path for increasing the light spot area of the excitation light emitted from the first light source 111 on the reflective scattering region 132, the light source system 100 places the light deflecting device 140 in the optical path between the first light source 111 and the wavelength conversion device 130 when the emission of blue light is required, and the light source system 100 deviates the light deflecting device 140 from the optical path between the first light source 111 and the wavelength conversion device 130 when the emission of red light or green light is required.

The light collection assembly 150 collects and guides the outgoing light of the wavelength conversion device 130 into the light unifying device 160 for the light unifying process. In the first embodiment, the light collection assembly 150 includes a bowl-shaped reflective surface 151, the reflective surface 151 is located between the condenser lens 121 and the wavelength conversion device 130, and a side of the reflective surface 151 opposite to the wavelength conversion device 130 is recessed and coated with a highly reflective film. Therefore, the outgoing light from the wavelength conversion device 130 is reflected by the side of the reflection surface 151 coated with the high reflection film and enters the dodging device 160.

In the first embodiment, the light uniformizing device 160 is a square light uniformizing rod, and in other embodiments, the light uniformizing device 160 may also be a light uniformizing rod with other shapes or a fly eye lens with the same light uniformizing function.

Further, a light through hole 1511 is opened in a bowl center region of the reflection surface 151. It is understood that the light through hole 1511 is disposed near the focal point of the condensing lens 121 on the side away from the first light source 111, so that the excitation light emitted from the first light source 111 passes through the light through hole 1511 and enters the wavelength conversion device 130.

Further, the light source system 100 further includes a first collimating lens 181 for collimating the blue excitation light emitted from the first light source 111, a second collimating lens 182 for collimating the red light emitted from the second light source 112, and a third collimating lens 183 for collimating the green light emitted from the third light source 113. It is understood that although the divergence angle of the excitation light is small, the brightness is reduced due to the enlarged cross-sectional area of the light beam during propagation, and thus the collimation of the light beam needs to be improved.

In the first embodiment, the number of the first collimating lenses 181 is equal to the number of the lasers 1111 and is arranged in one-to-one correspondence with the lasers 1111, and the excitation light emitted from each of the lasers 1111 is collimated by a corresponding one of the first collimating lenses 181.

It should be noted that the excitation efficiency of the phosphor is affected by the power density of the spot of the excitation light incident on the wavelength conversion device 130, and the phosphor saturation is more serious as the power density is higher, i.e., the excitation efficiency of the phosphor is lower as the power density is higher. In order to improve the excitation efficiency of the phosphor, the position of each laser 1111 is adjusted to deviate from the optical axis of the corresponding first collimating lens 181 in different degrees, so that the emission angle of the excitation light emitted by each laser 1111 after passing through the corresponding first collimating lens 181 is different, and thus the excitation light emitted by each laser 1111 is converged and does not coincide with the light spot on the wavelength conversion device 130, the power density of the light spot of the excitation light incident on the wavelength conversion device 130 is reduced, and the excitation efficiency of the phosphor is improved.

Referring to fig. 7, fig. 7 is a schematic structural diagram of a light source system 200 according to a second embodiment of the present invention. The light source system 200 of the second embodiment is substantially similar to the light source system 100 of the first embodiment, and also includes a first light source 211, a second light source 212, a third light source 213, a light gathering device 220, a wavelength conversion device 230, a light deflecting device 240, a light collecting assembly 250, and a light uniformizing device 260.

The light source system 200 provided in the second embodiment is different from the light source system 100 provided in the first embodiment in that: the light collection assembly 250 includes a collection lens group 251, a regional diaphragm 252, and a light directing device 253. Therein, the area membrane 252 includes a blue light transmitting region 2521 and a reflective region 2522. The blue excitation light emitted from the first light source 211 sequentially enters the wavelength conversion device 230 through the blue transmission region 2521 and the collection lens group 251. Emergent light of the wavelength conversion device 230 is reflected by the collection lens group 251 and the reflection region 2522 in sequence, and guided by the light guide device 253 to enter the dodging device 260.

Referring to fig. 8, the wavelength conversion device 230 of the second embodiment is substantially similar to the wavelength conversion device 130 of the first embodiment, and includes a wavelength conversion region 231, a reflective scattering region 232 and a transmissive scattering region 233, wherein the wavelength conversion region 231 is equally or unequally divided into a red fluorescence excitation region 231r capable of generating red fluorescence and a green fluorescence excitation region 231g capable of generating green fluorescence. The difference lies in that: the wavelength conversion device 230 further includes a filter region 234, and the filter region 234 is used for filtering a wavelength portion of the emergent light from the wavelength conversion device 230, where the color saturation is insufficient, so as to make the emergent light from the light source system 200 more pure.

Specifically, the filter region 234 includes a blue light filter region 234b, a red light filter region 234r, and a green light filter region 234g, which are annular and arranged in segments along the circumferential direction. The central angles of the blue light filter region 234b and the reflection scattering region 232 are equal and are arranged oppositely at 180 degrees; the central angles of the red light filter region 234r and the red fluorescence excitation region 231r are equal and are arranged oppositely in 180 degrees; the central angles of the green light filter 234g and the green fluorescence excitation region 231g are equal and are arranged oppositely at 180 °.

In the second embodiment, the light guiding device 253 includes a relay lens 2531 and a reflector 2532, and emergent light of the wavelength conversion device 230 sequentially passes through the collecting lens group 251 for transmission, the reflective region 2522 for reflection, the relay lens 2531 and the reflector 2532 for reflection, and enters the dodging device 260 after being filtered by the filter region 234.

Compared with the light source system 100 provided in the first embodiment, the light collection assembly 250 in the light source system 200 provided in the second embodiment can effectively reduce the loss of the outgoing light of the wavelength conversion device 230. The reason for this is that: the light through hole 1511 opened in the bowl center area of the reflective surface 151 in the first embodiment can pass the outgoing light of the wavelength conversion device 230, resulting in light loss; in the second embodiment, red and green light in outgoing light from wavelength conversion device 230 cannot pass through blue-light transmitting region 2521, thereby reducing the loss of outgoing light. In addition, the blue light emitted from the wavelength conversion device 230 can be regarded as substantially unpolarized light, and since the blue excitation light incident on the reflective scattering region 232 of the wavelength conversion device 230 is scattered to cause a change in polarization state, the blue light transmission region 2521 can be coated to transmit the blue light of a specific polarization state and reflect the blue light of other polarization states, thereby further reducing the loss of the emitted light from the wavelength conversion device 230.

In addition, compared with the light source system 100 provided in the first embodiment, the light collection assembly 250 in the light source system 200 provided in the second embodiment reduces the volume of the light source system 100 in the projection apparatus by the collection lens group 251, and is more practical.

Referring to fig. 9, fig. 9 is a schematic structural diagram of a light source system 300 according to a third embodiment of the present invention. The light source system 300 of the third embodiment is substantially similar to the light source system 200 of the second embodiment, and also includes a first light source 311, a second light source 312, a third light source 313, a light focusing device 320, a wavelength conversion device 330, a light deflecting device 340, a light collecting assembly 350, and a light uniformizing device 360.

Referring to fig. 10, the wavelength conversion device 330 in the third embodiment is completely the same as the wavelength conversion device 230 in the second embodiment, and also includes a wavelength conversion region 331, a reflection scattering region 332, a transmission scattering region 333, and a filter region 334, wherein the wavelength conversion region 331 is equally or unequally divided into a red fluorescence excitation region 331r and a green fluorescence excitation region 331g, and the filter region 334 includes a blue light filter region 334b, a red light filter region 334r, and a green light filter region 334 g.

The light source system 300 provided in the third embodiment is different from the light source system 200 provided in the second embodiment in that: light collection assembly 350 includes collection lens group 351, dichroic sheet 352 capable of transmitting blue light while reflecting red and green light, mirror 353, and light directing device 354. I.e., dichroic 352 and mirror 353 are used in place of area diaphragm 252.

Specifically, the dichroic sheet 352 is obliquely disposed with respect to the wavelength conversion device 330 and the mirror 353 is located on a side of the dichroic sheet 352 opposite the wavelength conversion device 330. The blue excitation light emitted from the first light source 311 sequentially enters the wavelength conversion device 330 through the dichroic plate 352 and the collection lens group 351. The red light or the green light in the emergent light of the wavelength conversion device 330 is reflected by the collecting lens group 351 and the dichroic sheet 352 in sequence, guided by the light guiding device 354 to enter the dodging device 360 after passing through the filter region 334. Blue light in emergent light of the wavelength conversion device 330 sequentially passes through the collection lens group 351, the dichroic sheet 352 for transmission, the reflector 353 for reflection, the dichroic sheet 352 for transmission, and is guided by the light guiding device 354 to enter the dodging device 360 after passing through the filter region 334.

Compared to the light collection assembly 250 of the second embodiment, the light collection assembly 350 of the third embodiment uses the dichroic sheet 352 and the reflecting mirror 353 instead of the area diaphragm, and can further reduce the loss of the outgoing light of the wavelength conversion device 330.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A light source system, comprising:

a light source comprising a first light source;

a wavelength conversion device;

the light condensing device comprises a condensing lens, and the condensing lens is used for condensing the exciting light emitted by the first light source on the wavelength conversion device; and

and the light deflection device is arranged in an optical path between the first light source and the wavelength conversion device in a time-sharing manner and is used for deflecting part of light beams emitted by the first light source so as to adjust the area of light spots irradiated on the wavelength conversion device by the first light source.

2. The light source system according to claim 1, wherein the light deflecting means is disposed in a light path between the first light source and the light condensing means in a time-sharing manner.

3. The light source system according to claim 1, wherein the light deflecting means is disposed in a light path between the light condensing means and the wavelength converting means in a time-sharing manner.

4. The light source system according to any one of claims 1 to 3, wherein the wavelength conversion device comprises a wavelength conversion region, a reflective scattering region and a transmissive scattering region, wherein when the excitation light emitted from the first light source is converged by the light condensing device at the wavelength conversion region of the wavelength conversion device, the light deflecting device is located in a light path between the first light source and the wavelength conversion device for reducing a light spot area of the excitation light on the wavelength conversion device, and when the excitation light emitted from the first light source is converged by the light condensing device at the transmissive scattering region of the wavelength conversion device, the light deflecting device deviates from the light path between the first light source and the wavelength conversion device.

5. The light source system according to any one of claims 1 to 3, wherein the wavelength conversion device comprises a wavelength conversion region, a reflection scattering region and a transmission scattering region, wherein when the excitation light emitted from the first light source is converged by the light converging device at the reflection scattering region of the wavelength conversion device, the light deflecting device is located in a light path between the first light source and the wavelength conversion device to increase a light spot area of the excitation light on the wavelength conversion device, and when the excitation light emitted from the first light source is converged by the light converging device at the wavelength conversion region of the wavelength conversion device, the light deflecting device deviates from the light path between the first light source and the wavelength conversion device.

6. The light source system of claim 1, wherein the light source further comprises a second light source and a third light source, the first light source is configured to emit a blue light excitation light, an ultraviolet light excitation light, an infrared light excitation light, or a green light excitation light; the second light source is used for emitting one of red light, blue light and green light; the third light source is used for emitting one of red light, blue light and green light.

7. The light source system of claim 1, further comprising a light collection assembly and a light homogenizing device; the light collection assembly collects emergent light of the wavelength conversion device and guides the emergent light to enter the light homogenizing device for light homogenizing treatment.

8. The light source system of claim 7, wherein the light collecting assembly comprises a bowl-shaped reflecting surface between the condenser lens and the wavelength conversion device, and a side of the reflecting surface opposite to the wavelength conversion device is recessed and coated with a highly reflective film; and a light through hole is formed in the central area of the bowl of the reflecting surface.

9. The light source system of claim 7, wherein the wavelength conversion device further comprises a filter region; the light collection assembly comprises a collection lens group, an area diaphragm and a light guide device, wherein the area diaphragm comprises a blue light transmission area and a reflection area; the blue light exciting light emitted by the first light source sequentially passes through the blue light transmission area and the collecting lens group to be incident to the wavelength conversion device; emergent light of the wavelength conversion device is reflected by the collecting lens group and the reflection area in sequence, and guided by the light guide device to enter the dodging device after passing through the filter area.

10. The light source system of claim 7, wherein the wavelength conversion device further comprises a filter region; the light collection assembly comprises a collection lens group, a dichroic sheet capable of transmitting blue light and reflecting red light and green light, a reflector and a light guide device; the blue excitation light emitted by the first light source sequentially passes through the dichroic sheet and the collecting lens group to be incident to the wavelength conversion device; red light or green light in emergent light of the wavelength conversion device is reflected by the collecting lens group and the dichroic sheet in sequence, guided by the light guide device to pass through the filter region and then enter the dodging device; blue light in emergent light of the wavelength conversion device sequentially passes through the collecting lens group, the dichroic sheet for transmission, the reflector for reflection and the dichroic sheet for transmission, and is guided by the light guide device to pass through the filter area and then enter the dodging device.

11. The light source system according to claim 1, wherein the light deflecting device includes a light deflecting device and a driving member capable of moving the light deflecting device, the driving member moving the light deflecting device in a periodic motion.

12. The light source system of claim 11, wherein the light deflecting device comprises one or more of a wedge prism, a lens, and a mirror.

13. The light source system of claim 1, wherein the first light source comprises a plurality of lasers arranged in an array; the light source system also comprises collimation lenses, the number of which is equal to that of the lasers, and the collimation lenses are arranged in one-to-one correspondence with the lasers.

14. A projection apparatus comprising the light source system according to any one of claims 1 to 13.